1 cup lux soap flakes
4 cups boiling water
food colouring or dye to colour

Put the boiling water in a bowl and sprinkle the soap flakes on top. Gently mix until all the soap flakes are dissolved. Add colouring before it sets or let the kids mix it through while playing. The setting process takes at least an hour and the mixture resembles jelly once set.

Keeps well in a sealed container.